Brake



Nov. 22, 1927.

v. fai-:Noix

BRAKE Filed sept. 1, 1926 mVENTOR vVnNcENTy BENmx FIG. 5;

Patented vlivovl 22", 1927.

.UNIflfED'-sTTr;s,` PATENT... l

vINCEivT BmvDIx, or CHICAGC, ILLINOIS,- AssICivon Ifo BENDIX BRAKEcentran,- or

- CHICAGO, ILLINCIS, a CQRPORATICN or ILLINOIS. v

" BRAKE.'

Application med september -1, 192s. seri-a1 No. 132,910.

This invention relates to brakes, and is illustrated as embodied in anvinternal expanding automobile b'rake. An object of the invention isvtoprovide the shoes or their equivalents with novel rollers, to lessenthe.

Y' a -thrust substantially tangential of the brake instead of ya directwedging actiononl'y. In

" A one very(desirable,arrangement'one part of the frictionlmea'ns islonger than the other,

being illustrated as twice as-long, andthe distances between the rolleraxes and the cam axis are in proportion to the lengths of saidparts. Animportant feature of the lnvention re-v lates toa novel roller mounting,the rollers` preferably being arranged in pairs between which 'projectsa rib or the like positioning the shoe end laterally.

The above and otherobjects and features of the invention, includingvarious novel combinations of parts and desirable particularconstructions, will be apparent from the following ldescription of theillustrative constructions shown in theaccompanying drawin in whichz'igure 1 vis a partial section through the brake just inside the head ofthe brake drum and showing thel shoes in side elevation; Figure 2 is apartial section on the line I 2-2 of Figure 1 through the cam and theItwo sets of rollers; and

Figure 3 is a section through one of the shoes on the line 3- 3 ofFigure 1.

`The bra-ke illustrated in the drawing includes a drum 10 rotating witha wheel (not shown) at the open side of which is arranged a suitablesupport suclias a backing plate 12 and within which is arranged suitablefric-4 tion means shown as including in this par- I 1 ticularlbraketthree shoesv 14, 16, and 18. Shoe 18 isjanchored on a pivot 2Ocarried by the, backing plate 12, and shoe '16 is anchored on a pivot 22also carried by the backing plate 12, while shoe 14 is i connected tothe unanchored end of shoe 16 by afloating pivot 24.v lThe brake isappliedl by novel means, which is described below and which forms thegeneral subjectmatter of the present 'invention, and which acts `toforce the shoes- .14and-l8 apart toward the drum against the resistanceof-al return spring 26, whereupon'shoe ,14. actsv against thereslstancefofv an auxiliary'return spring 28 toforce the shoe'16voutwardly to# ward the drum.v When the brake' `is released,-

the spring Y28 urges the shoe laway'from the drumv to an idle-positiondetermined by a stop 30 of any desired character, Thepar.

ticular shoes illustrated are built up of pairs ofsta-mpings 32 and 34,cachotv which is generally L-shaped .in cross-section, and

which are secured together back 'toback Aso that theirl inwardly-extendaanges forlu` the curved friction faceto W ich is riveted= or otherwisesecured any suitable brake lin-3 1ng36: According to an importantfeature of the present invention. the shoes 14 and18 yor the equivalentfriction means of the brake are provided at their adjacent ends with inovel rollers engaging a thrust member movable about an axis betweensaid ends. In the arrangement illustrated in Figures 1 and 2,

a pivot member 38 is carried by the stiffen-l ing web of each of theshoes at its free end, the pivots shown being provided with enthickrfessof the stift'ening web formed by' the two ianges of the stampings andwith posite sides of the shoes and carrying rollers 40 and 42 which arespaced aparta distance equal to the thickness of the stiii'ening web andwhich project beyond the end of thtl stiffening web. The lrollers 40 and42 are prevented from displacement on the pivots 38 by means such aswashers 44 held in place by peening or riveting over flanges v. 46formed on the ends of the pivots.

I prefer to provide a brake-applying thrust member, shown as a doublecam 48,

with means such as acentral rib 50 project' lalged central portions orcollars ofthe parts of reduced diameter extending on op- As best appearsin. Figure 1, the one set of rollers 42 isV arranged with the rolleraxis on the side of-the cam axis next the axis of the drum, whereas theother rollersl 4Q,v

are arranged with their roller axis on the as shoe 18', the distances ofthe -roller axes from thevcam axis radially of the drum should be inproporti'oitt tlie lengthsof thepa-rts of the friction 'means In thepresent'instance,'where-the one part isttvicel should j be'approximatelyf twice as "far radi-V 4. A brake comprising, in.combination, a drumfa' friction device engageablex with the drum'aniincluding parts oneof'whieh is approximately double the other in lengthandl which have adjacent ends, a thrust member .movable vabout an axisbetween said ends, and rollers on said ends engaging the thrust member,the roller on one end engaging th'e thrust member on the side of itsally oftheflrum Efrom'theicai'n 'axis 'as' is the-` axis-@finie Tners4.o.

been described .in* det'ail it is' not my inten'tioiilto limitthescopeiof the invention to thfay' particular" embodiment orotl'ierwisel meaty' meterme of; the appended claims.

Ifo-lain: j 1. A brake comprising, in.v combination, a druin, a frictiondevice en'gageable with the drum 'and having adjacent ends movable jengaging the thrust member between its axis and the axis' of the drum,the vleverage or the thrust member on sai'd'rollers being in proportionto the movement of the rollers in applying thebrake;

2j. A- brakev comprising'. in combinatio'ma drum, a friction deviceengageable with the drum'and having adjacent ends movable differentdistances in applying the brake, a double camjmovable about an axisbetween said ends, and rollers on said ends engaging the cam, one of therollers engaging the cam between its axis' and the outside of the drum,and the other roller engaging the cam between' its axis and the a'xis ofthe drum, the leverage of the camion the' rollers being in proportion tothe movement of the rollers in applying the brake.

3. A brake co'nipri'sing, in' combination. a dru', a friction deviceengageable"\\i.th the drum" ll'and including parts of' different lengthshaving adjacent ends, `a thrust mem'-, ber movable about an axisbetween'saidentl's. and rollers on said ends engaging thetli'rusll member, theroller on one and' engaging the thrust member on' the side of its axisAn'ext the drum axis and' the other on' the opp'o site side of its axis-from the' drum axis, the distance radially of the drum between the axisof'the thrust member and the axis yof thev roller on the-longer partIbeing greater than the distance between said thrust intein'- ber axisand the axis of' th'e roller on the shorter part.

whatlv @nega-narrate ambten-leur has' tjeeting'bet-ween said rollers topositionv the l axis'next the dri'im' axis and the other on the oppositeside of its axis 'from the drum axis,

the di'stan'ceradially of the'drum" between tl e Y axis of gthe' thrustfmember; andLv the* axis ot the rolleron lthe longer'pait being doublethe distance between' I said thrust' member axis and the axis ofthe'roller on'theshorter art. p 5. JMbrakeshoev having a stieningweb 'atleast at its end,fand la pairor-rollers mountedg on opposite'sides ofsaid web-ii l 6? ,A 'brake shoe havingasti'tiening'web at? least at itsen'd, and a pair o`r rollers mounted on opposite sides of .said web, in'combination with la thrust member having'a part proshoe laterally.

7.. A brake'shoe havingiastiiening web at' least at its end, and a pairof rollers mounted on opposite sidesof said web, vin combination with a.cam having a central rib projecting between said rollers to position theshoe laterally. f 8. A brake shoe including twol ianges secured betweenthe edges ofthe shoe to form a: stiiening web, a pivot member carried bysaid flanges, and a roller' ymounted on the pivQt member. andtransmittin-glbraieapplying thrust to bo'th of said ianges.

9.11 brake shoe including two flanges secured between the edges of theshoe toform a stitiening" web, a pivot member carried by. and projectingon opposite sides of saidV flanges, and'ro'llers mounted on the oppositeprojecting ends of the pivot member.

10. A brake shoe having' a stiifening web,

a pivot member carried by and projecting on opposite sides of said web,and rollers mounted on the opposite projecting ends ofthe pivot mcnxber.v 11.. A brake comprising` in cinnbinatioli, friction means havingadjacent ends andv haring spaced pairs of rollers at its said ends, anda brake-applying thrust member having a part projecting between the tworollers oit each pair of spaced rollerst-o position saidends'latei'ally.

12. brake comprising. ini ciinibi'nation'` 'friction n'ieans`havingradjrfcent er'ds anti having spaced pairs of rollers at it's" saidend's and a brake-applying double cam ha'v'- iga' rib projecting betweenthe two rollers of each pair of spaced rollers to position saidendslaterally.

13. A brakecomprising, in combination, a friction member having a.roller, and a brake-applying member having a rib engaging the side faceof the roller to prevent lateral movement of the friction member.

14. A brake comprisingq in combination. a friction member havingI:spaced rollers at its end, and a cam opciativtd'x/v engaging' therollers 'and interlocking` withthe rollers to prevent lateral movementof the friction member.

l5. A. brake cfmiprisino', in combinationy a friction member`r abrake-applying memberv` and a pair of spaoedrollers carried by one ofsaid members and having their edges engaged by the other member, saidother member having a r'ib projecting between the rollers in such amanner to Cooperate with the rollers in positioning the friction memberlaterally.

16.- A brake shoe' having a stifening;T Web formed with' an opening, andprovided with a pivot meinberhaving a relatively large. central sectionof the same thickness asfsa-id web and arranged insaidopening andhaving' smallerdiameter portions'projecting on opposite sides of saidweb, in combination with rollers mounted on said smaller diam eterportions and engaging the ends of the central. section and the sides ofsaid web to prevent axial movement of the pivot ineinber, and means atthe ends of said smallerdiameter portions restraining the rollersagainst axial movement.-

In testimony whereof, dI have hereunto signed my name.

VINCENT BENDIX

